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Tin--polymetallic deposits, with a characteristic elemental association of Sn.Cu.Pb,Zn,Au,Ag andsometimes Fe, W and Mo, are widespread in the Nanling region, South China. Like W--Sn-Nb-Ta--Be(REE)deposits, they are commonly associated with acid graniles. Therefore. it has long been considered that tin-bearing granitic magma derived from anatexis in the tin-rich belt in the sial crust is the only source of primarytin mineralization. ineluding the tin-polymetallic deposits discussed in this paper. Genetically they arp relatedto the continental crust--reworked(l--type and S--type) granites. Based on geologic and geochemical features and, particularly, REE geochemical features, it is proposedthat the granite bodies related to tin--polymetallic deposits in this region are producls of the derived acidmagma generated by partial melting and fractional crystallization from basaltic--andesititc rocks plus a smallamount of sial rocks in the lower crust.
Sn-Cu-Nb-Ta-polymetallic deposits, with a characteristic elemental association of Sn.Cu.Pb, Zn, Au, Ag andsometimes Fe, W and Mo, are widespread in the Nanling region, South China. It has long been been considered that tin-bearing granitic magma derived from anatexis in the tin-rich belt in the sial crust is the only source of primarytin mineralization. Ineluding based on geologic and geochemical features and, particularly, REE geochemical features, it is proposedthat the granite bodies related to tin - polymetallic deposits in this region are producls of the derived acidmagma generated by partial melting and fractional crystallization from basaltic - andesititc rocks plus a smallamount of sial rocks in the lower crust.